power supply turns on computer lights, fan, dvd/cd drives... everything but monitor, mouse and keyboard. Related: Computer not recognizing monitor keyboard mouse; Computer turns on but no display on monitor or keyboard - Best answers; Monitor shuts off keyboard and mouse stop working - Best answers; There's power, but no output on monitor and mouse/keyboard, beep - Forum - CPU/Desktop Turn on, nothing. I have to press it a few times to get the blue light on. Something about a file not right and I can only remember an 'hmode' or something like that. Check the power Please check the connection between the power cord, AC adapter, power extension cord, and the electric socket are well connected as shown below. It's not normal. This is not normal. 5) Connect the AC power cord to the power supply, and then turn on your computer. Check the fix below. Ever since then, the keyboard/mouse still do not work, the monitor is just a black screen, and I can hear the fans. If your computer still can’t boot properly, don’t worry. PC boots up but no display and no keyboard or mouse light ... blinking constantly but the monitor wouldn't turn on. Again, I hard powered down and restarted. Since you mention no keyboard lights hook up another keyboard the monitor cable, computer power cable and try turning on the system again.. Do you see the bios screen now? The PSU turns on the GPU, CPU fan, case fans, and I feel the HDD's slight vibration. Please try the following steps for troubleshooting: 1. Only lights that come on are inside the tower itself... no lights on keyboard, monitor or mouse. Try different PSU Same thing. The only way my PC should turn on is from clicking the power button, not my keyboard keys or mouse keys. keyboard, monitor and mouse do not turn on. Another thing I noticed is the power button suddenly turns off when I turn the PC on. Not sure if it has something to do with the Power Options > Hard disk setting, or if it's something else. I accidentely click my mouse or keyboard and my PC turns on. I just started my PC after a while & it turns ON, lights turn on, but there is NO Display on Monitor. Sometimes after my display goes into power saving mode, it will not turn back on through mouse or keyboard action, though normally it does. Strange. The computer has nothing on the monitor screen - it doesn't turn on. This never happened before. Improper BIOS settings can also cause your PC to boot into a black screen. Cannot boot to desktop. So here is the setup: Asrock Z87E itx mobo Core i7 4790 12gb ram 600W Silverstone PSU GTX 1070 So I connect it all outside of the case since case is coming in still. Connected everything. I unplugged the power for a day and turned it back on, and this time it was blue. Posts : 28,019. Win 10 Pro (1903) New 10 Jun 2017 #6. The only thing that works is DVD drive - I can open and close it. 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